ZoneAlarm is designed to protect your DSL- or cable-connected PC from hackers. This program includes four interlocking security services: a firewall, an application control, an Internet lock, and Zones.

• The firewall controls the door to your computer and allows only traffic you understand and initiate.

• The application control allows you to decide which applications can and cannot use the Internet.

• The Internet lock blocks Internet traffic while your computer is unattended or while you're not using the Internet, and it can be activated automatically with your computer's screensaver or after a set period of inactivity.

• Zones monitor all activity on your computer and alert you when a new application attempts to access the Internet.